Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1997-10-09
1999-05-18
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
With stabilizing features
318448, 318623, 83 30, 83575, 32420726, G05B5/01
Patent
active
059053526
ABSTRACT:
Dimpling of a workpiece by rebounding of a magnetic repulsion punch mechanism, when operated at high punching rates, is avoided by application of a damping pulse at a point at or subsequent to a mid-point of a return stroke of the punch from the workpiece and preferably within the last 10% of the return stroke. This damping pulse is preferably a fraction of the pulse width and of approximately the same amplitude as a driving pulse applying kinetic energy to the punch for causing punching of the workpiece. At high punching rates the kinetic energy of the return portion of a punching stroke is substantially determined by elastic rebounding of the punch from a guide bushing. The removal of kinetic energy during the return portion of the stroke allows the return of the punch to a position close to a rest position during a very short interval with small overshoot under control of mechanical damping. Since dynamic damping may be substituted for much of the mechanical damping in the punching arrangement, high quality punching may be accomplished at much increased punching rates. A preferred form of monitoring punch position employs RF reflected inductance and may be used to form a time expanded image of punch movement.
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Carbaugh, Jr. William Dale
LaPlante Mark Joseph
Long David Clifford
Setzer Christopher David
Stroms Karl Friedrich
Ahsan, Esq. Aziz M.
International Business Machines - Corporation
Ro Bentsu
LandOfFree
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